Abstract
Studies of macrophytes in the coastal zone of the Artic Seas, including the White Sea, have shown the essential role of these algae in the activity of the coastal half-latitude ecosystems. In summer, during the macrophyte reproduction period, a great number of reproduction products are released into the water. For a short time, this considerably affects the ratio of the nanoplankton in the populations that inhibit the vast and shallow coastal areas. At different coastal sites in Chernorechenskaya Inlet, Kadalaksha Bay, during the period of intensive reproduction of Ascophyllum nodosum and Fucus vesiculosus, 42 plankton samples were collected in 2005. During this period the concentration of antherozoids in the water reached 55000 cells/ml (216 mg C/m3). The number of eggs was within the range of 0.05–0.7 cells/ml. The proportion of antherozoids in the total biomass of nanoplankton varied at different coastal sites from 0.37 to 99%, with a mean of 46% for the reproduction period of A. nodosum, and only 7% for the reproduction period of F. vesiculosus. As was shown by counts of F. vesiculosus female gametes in sedimentation traps, 1 m2 of the macrophyte bed (assuming 100% coverage) produces 18000–108000 eggs per day (0.33–2 mg C). The calculated flux of the reproductive material from the brown algae beds to the coastal water shows good agreement with the sample counts.
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Original Russian Text © O.V. Maximova, A.F. Sazhin, 2010, published in Okeanologiya, 2010, Vol. 50, No. 2, pp. 218–229.
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Maximova, O.V., Sazhin, A.F. The role of gametes of the macroalgae Ascophyllum nodosum (L.) Le Jolis and Fucus vesiculosus L. (Fucales, Phaeophyceae) in summer nanoplankton of the White Sea coastal waters. Oceanology 50, 198–208 (2010). https://doi.org/10.1134/S0001437010020050
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DOI: https://doi.org/10.1134/S0001437010020050